When comparing UDK vs Torque3D, the Slant community recommends UDK for most people. In the question“What are the best 3D game engines?” UDK is ranked 17th while Torque3D is ranked 25th. The most important reason people chose UDK is:
UDK has an extremely large toolset that allows creating almost anything without having to use a 3rd party tool or plugin.
Specs
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Pros
Pro Large toolset
UDK has an extremely large toolset that allows creating almost anything without having to use a 3rd party tool or plugin.
Pro Triple A track record
UDK is an engine used by many big name companies for popular games such as the Gears of War series.
Pro Free and open source
Torque3D is a free game engine licensed under MIT with source code available on GitHub.
Pro Incredible Performance on low-end PCs
Even on low-end-PCs the Engine and its games run perfect.
Pro Many stock features for a FPS but flexible enough for other Genres
Pro Continually updated by a dedicated and skilled community
Pro Easy to implement 32 to 64 multi-player networking
Torque's approach to networking makes this one of the best performing and easiest to implement multiplayer game engines available.
Pro Redistributable tools
Cons
Con Superseded by Unreal Engine 4
Con DevKit only runs on Windows
Even though UDK can deploy games to run on multiple platforms, including Mac, it does not feature support for development on Mac.
Con Limits games to FPS
UDK was originally developed for the FPS, "Unreal Tournament", and it certainly shows. While UDK is a very powerful engine, it takes quite a bit of work to make it do something other than an FPS.
Con Aging
If you are planing on using some of the latest graphical options, pick another engine.
Con Weak AI
Movement AI is limited to moving in a straight line.
Con Limited platforms
Torque3D only publishes to desktop and mobile.